Pump mechanism for carpet-sweepers.



J. T. JOHNSON. PUMP MEGHANISM POE CARPET SWBEPERS.v

APPLICATION FILED MAY 1, 1913.

Patnted Dec. 2, 1913.

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JOHN T. JOHNSON, OF WORCESTER, MASSACHUSETTS, ASSIGNOR OF ONE-HALF T0 VERNER G. ANDERSON, OF WORCESTER, MASSACHUSETTS.

PUMP MECHANISM FOR CARPET-SWEEPERS.

Specification of Letters Patent.

Patented Dec. 2,1913.

Application mea May 1, 191s. semi No. 764,818.

To all whom t may concern:

Be it known that I, JOHN T. JOHNSON, a citizen of the United States, residing at the city of lVoicester, in the county of W'orcester and State of Massachusetts, and whose post-oilice address is 1l Dover street, in said city, have invented certain new and useful Improvements in Pump Mechanism for Carpet-Sweepers, of which the following is a specification. n

My invention relates to improvements in the pump mechanism of a pneumatic dust remover for use on iioors and carpets, and has fo-r its Object to provide an auxiliary suction chamber having an inlet located beyond the rear or bot-tom of the dust bag, in order to permit the pneumatics to increase the suction and cause the same to force straight through the full depth of the bag, and thereby to enable the bag to receive the dust collections in an evenly distributed manner toward its bottom part. Y

A further object in view is to provide an auxiliary chamber in communication with the pneumatics and located close to the high-est point o-f lifting movement of the latter, and means to control the suction from said chamber whereby the upper part of the dust bag is kept fully distended.

The invention consists in the details of construction and combination of parts as hereinafter described and claimed, reference being had to the accompanying sheet of drawings, wherein like reference characters indicate like parts.

Figure l is a vertical longitudinal section of a vacuum sweeper, taken on line fra-w. of Fig. 2, showing the parts embodying my improvements, and, Fig. 2 is a transverse section of the device, taken on line w.-m. of

My improvements are essentially designed for application to the form of carpet sweeper having the ordinary construction of casing -afor inclosing the dust bag -b-; the removable suction head -c-; the pneumatics -6Z- Operated by the connections ,-ethrough crank shaft -f-, and a handle gfor the operators use in moving the device over the surface to be cleaned. At a point near the back of the casing cz- I divide its suction chamber L1 by a transverse partition -a.2-, in order to provide an auxiliary suction chamber as- The partition -a2 has a long opening -atwhich extends near to the sides of the casing, to receive the suction from the dust bag -Z)-. The longitudinal center of the opening -at is in alinement to the centers of the' mouth b1- of the dust bag and elongated slot -clof the suction head -c-. Each pneumatic CZ has an upper movable leaf d1- and a lower leaf -d2-, which is secured to the top of the casing and provided with a 'large'oblong opening extending longitudinally' of each vpneumatic and from near the working end thereof, as at -gL-, to surround a flap valve -t-l; The valve controls ports y', j-

`formed through the top of the casing fzand communicating with the auxiliary chamber -a4-, and said valve has one end secured on said casing and its free end movable on screws which form stops, as -7n-, to limit the upward movement of said valve above its said ports -j-. Having the controlling valve -c'farranged to have a free portion lift at a point close to the large end of the pneumatic, permits of greater suction aro-und this portion of said valve after being brought to an opened position against the stops lc- As the sweeper moves along the surface of the floor or carpet a continuous and partial vacuum is created in the chambers a1- and -awhich draws the air and dust through theinlet c1- of the nozzle and intothe bag -b-, and from the latter the suction takes the air through the inlet *afof the auxiliary chamber -a3-, through the valve-controlled-ports -j-. The air is forced by the bellows or pneumatics through valve controlled outlets O formed in the upper leaf of each pneumatic, from whence the air passes from beneath a. cover -pof the device and from the rear of the same. The relative increase o-f length of the pneumatics, afforded by the extra chamber -a3--, permits of a corresponding increase of space for their movable leaves to travel, and results in greater power to be had by the pneumatics without enlarging the normal distance between the surface -sand highest point -tof the sweeper. Having the inlet -clocated at the rear of the dust bag, as shown, permits the air draft to pass in a straight direction thro-ugh said bag to this point of location of said inlet, thus maintaining the bag in an inflated condition to receive its dust collections, and thereby avoiding the use of a screen within the chamber a1- to prevent the bag closing against ports in said chamber as in the ordinary construction.

To form a minimum distance height of the device, between the surface -sand extreme upper part of its cover, as at -t, I provide a flat metallic member vswhich is bent a quarter turn at its center part, in order to have one portion secured iat upon the upper movable leaf -allof each pneumatic and the other portion projecting horizontally and pivotally connected to the crank-rod -e`-, thereby reducing the space between said leaf and the cover Z9- when each pneumatic is distended.

Having described my improvements, what I claim and desire to secure by Letters Patent, is

In combination with the crank-shaft and rod connect-ion therefrom, a casing, an auX- iliary chamber extending transversely of the latter and near to the shaft, and said chamber having a longitudinally-arranged air inlet, a horizontal bellows having its larger working end above and projecting rearwardly of the said chamber, ports formed in the top of the casing and leading from the said chamber, a flat pneumatic valve to control the suction from the ports to the bellows, said valve having one end secured to the casing and its unattached end provided with a perforation, a screw member loosely passing through the latter and secured to the casing, and said member to form a stop to limit the opening movement of said valve, and the member -o for attaching to the rod connection, substantially as set forth.

In testimony whereof I aiiix my signature in presence of two Witnesses.

JOI-IN T. JOHNSON.

Witnesses:

MARK N. SKERRETT, GEORGE A. REED.

Copies of this patent may be obtained for ve cents each, by addressing the "Commissioner of Patents, y

Washington, D. C. 

